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Calculating descent

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N510CE View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote N510CE Quote  Post ReplyReply Direct Link To This Post Topic: Calculating descent
    Posted: Oct-24-2012 at 3:32pm
How do I calculate when to start my descent from my typical cruise altitude which is FL310
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superglide View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote superglide Quote  Post ReplyReply Direct Link To This Post Posted: Oct-24-2012 at 4:55pm
Here's a little app that I find helpful: http://aerotexas.com/desplan/desplan.php
Joe Brown


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N510CE View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote N510CE Quote  Post ReplyReply Direct Link To This Post Posted: Oct-24-2012 at 7:48pm
I completely forgot about that app
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Raphouille View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Raphouille Quote  Post ReplyReply Direct Link To This Post Posted: Oct-26-2012 at 6:13pm
I use this one :

Distance to descend (NM) = difference between FL / 10  x 3
Rate of descent (ROD) = Groundspeed (GS) x 5

example:

Cruise FL310
Target altitude 3000 ft (FL30)
Difference / 10 = 31-3 = 28
Distance to descend = 28x3 = 84NM (let's round to 85)
Rate of descente (ROD) = GSx5 (e.g. 300 KTS GS = -1500 FPM)

Regards,
RaphaŽl Beaud
CPL/IR/FI
 
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N510CE View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote N510CE Quote  Post ReplyReply Direct Link To This Post Posted: Oct-29-2012 at 6:49pm
I'll try your method but I'm not good at math 
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Raphouille View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Raphouille Quote  Post ReplyReply Direct Link To This Post Posted: Oct-29-2012 at 7:15pm
Originally posted by N510CE N510CE wrote:

I'll try your method but I'm not good at math 


Me neither :-)

But my maths were forced to improve dramatically with that one  :-)

RaphaŽl Beaud
CPL/IR/FI
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ryanbatc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ryanbatc Quote  Post ReplyReply Direct Link To This Post Posted: Oct-30-2012 at 7:33pm
If you know distance to destination (which you have), convert that to minutes at current speed.

Example of conversion:
Say you're doing 360 kts ground speed... that's 6 miles per minute.  60 kts 1 mile/min etc

Select a descent rate (I use -1000 fpm).

Example for descent path:
You're 30 minutes from point you want to be (And you want to be at sea level).  You're at FL300.  If you descend @ 1000 fpm you will lose 30,000 ft in 30 min.

If you descend @ 500 fpm it will take you 60 min to lose 30,000 ft.

 (1000 fpm is the easiest rate to use and I like to use both ways)

It's not great when ATC steps you down, or you change speed often (or wind shifts), but you can easily interpolate a required FPM with the above knowledge as a baseline.
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N510CE View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote N510CE Quote  Post ReplyReply Direct Link To This Post Posted: Nov-02-2012 at 5:52pm
I know about that I've had ATC ask me to descend to 10,000 and I was at FL340 and I began a 1500 feet per minute descent rate and this was on vatsim to
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Airshane12 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Airshane12 Quote  Post ReplyReply Direct Link To This Post Posted: Apr-16-2013 at 11:02pm
If you have an Iphone, the app "Wild Blue" is awesome.  I use it all the time and it includes a decent calculator.  Good Luck!
CSM
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sir-crash View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sir-crash Quote  Post ReplyReply Direct Link To This Post Posted: Oct-24-2013 at 12:55pm
great link thank you for that
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